获得& lt; select& gt;的值无需使用php在同一页面上提交 [英] get the value of <select> without submitting on the same page using php

问题描述

希望有人可以帮助我.. 我使我的程序更简单，以便每个人都可以理解.. 我希望我的程序在不提交的情况下获取的值，我知道这只能通过javascript或jquery完成，所以我使用onChange，但是我想要的是当我选择一个选项时，该值应立即在同一位置传递页面，但使用php ..

Hope someone can help me.. i made my program more simpler so that everybody will understand.. i want my program to get the value of the without submitting, i know that this can only be done by javascript or jquery so I use the onChange, but what I want is when i select an option the value should be passed immediately on the same page but using php..

<select id="id_select" name="name" onChange="name_click()">
<option value="1">one</option>
<option value="2">two</option>
</select>

<script>
function name_click(){
value_select = document.getElementById("id_select").value;
}
</script>

然后我应该在post方法中将value_select传递到php中.我不知道我该怎么做..请帮助我.

and then i should pass the value_select into php in post method.. i dont know how i will do it.. please help me..

推荐答案

在未提交页面的情况下，无法使用PHP进行此操作.在页面 之前，PHP代码在服务器上执行，然后在浏览器中呈现页面.然后，当用户在页面上执行任何操作(例如，在下拉列表中选择一个项目)时，就不再有PHP.将此代码导入PHP的唯一方法是提交页面.

You cannot do this using PHP without submitting the page. PHP code executes on the server before the page is rendered in the browser. When a user then performs any action on the page (e.g. selects an item in a dropdown list), there is no PHP any more. The only way you can get this code into PHP is by submitting the page.

您可以要做的是使用javascript获取值-然后向传递所选值的php脚本触发AJAX请求，然后处理结果，例如

What you can do however is use javascript to get the value - and then fire off an AJAX request to a php script passing the selected value and then deal with the results, e.g.

$(document).ready(function() {
    $('#my_select').on('change', do_something);
});

function do_something() {
    var selected = $('#my_select').val();
    $.ajax({
        url:        '/you/php/script.php',
        type:       'POST',
        dataType:   'json',
        data:       { value: selected },
        success:    function(data) {
            $('#some_div').html(data);
        }
    });
}

使用此代码，每当下拉菜单中的选定选项发生变化时，都会向您的php脚本触发POST请求，并将选定的值传递给它.然后，返回的HTML将被设置为ID为some_div的div.

With this code, whenever the selected option changes in the dropdown, a POST request will be fired off to your php script, passing the selected value to it. Then the returned HTML will be set into the div with ID some_div.

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